I believe that the tool path should be forced to ENTER the print area through the PRIME PILLAR.
I have noticed that in some prints the tool runs over parts of the actual print before it reaches the PRIME PILLAR leaving bits of oozed material on the print affecting print quality!

(This behavior seems to be affected by the "avoid crossing open spaces" feature, a higher number on this feature may be forcing the tool to go to the nearest point on the print BEFORE it heads towards the PRIME PILLAR).

At the moment the prime pillar settings are equal for all tools. My problem is that I get over extrusion (a blob) on the prime pillar of my right head (PLA) and under extrusion on the pillar of my left head (PVA). Often this results in the print head knocking over the prime pillar resulting in a failed print.

Giving control over the settings of the individual heads would solve my problems.

As stated in a different post, giving the prime pillars a separate fill percentage could increase the print speeds a lot, while maintaining its function and stability.